<template>
  <div id="aCoursesList" class="bg-fa of">
    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps
      :active="2"
      process-status="wait"
      align-center
      style="margin-bottom: 40px;"
    >
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="提交审核" />
    </el-steps>

    <el-form label-width="120px">
      <el-form-item>
        <el-button type="text" @click="dialogChapterFormVisible = true">
          添加章节
        </el-button>
        <!-- 章节 -->
        <ul class="chapterList">
          <li v-for="chapter in chapterNestedList" :key="chapter.id">
            <p>
              {{ chapter.title }}

              <span class="acts">
                <el-button
                  type="text"
                  @click="
                    dialogVideoFormVisible = true
                    chapterId = chapter.id
                  "
                >
                  添加课时
                </el-button>
                <el-button type="text" @click="editChapter(chapter.id)">
                  编辑
                </el-button>
                <el-button type="text" @click="removeChapter(chapter.id)">
                  删除
                </el-button>
              </span>
            </p>

            <!-- 视频 -->
            <ul class="chapterList videoList">
              <li v-for="video in chapter.children" :key="video.id">
                <p>
                  {{ video.title }}
                  <span class="acts">
                    <el-button type="text" @click="editVideo(video.id)">
                      编辑
                    </el-button>
                    <el-button type="text" @click="removeVideo(video.id)">
                      删除
                    </el-button>
                  </span>
                </p>
              </li>
            </ul>
          </li>
        </ul>
        <div>
          <el-button @click="previous">上一步</el-button>
          <el-button :disabled="saveBtnDisabled" type="primary" @click="next">
            下一步
          </el-button>
        </div>
      </el-form-item>
    </el-form>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title" />
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number
            v-model="chapter.sort"
            :min="0"
            controls-position="right"
          />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title" />
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number
            v-model="video.sort"
            :min="0"
            controls-position="right"
          />
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <!-- 上传视频 -->
        <el-form-item label="上传视频">
          <el-upload
            class="upload-demo"
            action="http://localhost/api/vod/upload"
            :before-upload="beforeVideoUpload"
            :limit="1"
            :on-exceed="handleUploadExceed"
            :on-success="handleVideoSuccess"
            :file-list="fileList"
          >
            <el-button size="small" type="primary">点击上传</el-button>
            <el-tooltip placement="right-end">
              <div slot="content">
                最大支持1G，
                <br />
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、
                <br />
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、
                <br />
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、
                <br />
                SWF、TS、VOB、WMV、WEBM 等视频格式上传
              </div>
              <i class="el-icon-question" />
            </el-tooltip>
          </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button
          :disabled="saveVideoBtnDisabled"
          type="primary"
          @click="saveOrUpdateVideo"
        >
          确 定
        </el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import chapterApi from '@/api/chapter'
import videoApi from '@/api/video'
export default {
  data() {
    return {
      BASE_API: process.env.VUE_APP_BASE_API,
      dialogChapterFormVisible: false, //是否显示章节表单
      chapter: {
        // 章节对象
        title: '',
        sort: 0
      },
      courseId: '', // 所属课程
      chapterNestedList: [], // 章节嵌套课时列表
      saveBtnDisabled: false, // 保存按钮是否禁用
      saveVideoBtnDisabled: false, // 课时按钮是否禁用
      dialogVideoFormVisible: false, // 是否显示课时表单
      chapterId: '', // 课时所在的章节id
      video: {
        // 课时对象
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: '',
        videoOriginalName: ''
      },
      fileList: [] //上传文件列表
    }
  },

  created() {
    console.log('chapter created')
    this.init()
  },

  methods: {
    //初始化页面
    init() {
      if (this.$route.params && this.$route.params.id && this.$route.params.id !== "-1") {
        this.courseId = this.$route.params.id
        // 根据id获取课程基本信息
        this.fetchChapterNestedListByCourseId()
      }
    },

    //获取章节列表
    fetchChapterNestedListByCourseId() {
      chapterApi.getNestedTreeList(this.courseId).then(response => {
        this.chapterNestedList = response.data.data.items
      })
    },

    //编辑章节信息
    editChapter(chapterId) {
      this.dialogChapterFormVisible = true
      chapterApi.getById(chapterId).then(response => {
        this.chapter = response.data.data.item
      })
    },

    //删除课程章节
    removeChapter(chapterId) {
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      })
        .then(() => {
          return chapterApi.removeById(chapterId)
        })
        .then(() => {
          this.fetchChapterNestedListByCourseId() // 刷新列表
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
        })
    },

    //保存或更新章节
    saveOrUpdate() {
      this.saveBtnDisabled = true
      if (!this.chapter.id) {
        this.chapter.courseId = this.courseId
      }
      chapterApi
        .saveOrUpdate(this.chapter)
        .then(response => {
          this.$message({
            type: 'success',
            message: '保存成功!'
          })
          this.helpSave()
        })
        .catch(response => {
          this.$message({
            type: 'error',
            message: response.data.message
          })
        })
    },

    //保存成功后刷新列表
    helpSave() {
      this.dialogChapterFormVisible = false // 如果保存成功则关闭对话框
      this.fetchChapterNestedListByCourseId() // 刷新列表
      this.chapter.title = '' // 重置章节标题
      this.chapter.sort = 0 // 重置章节标题
      this.saveBtnDisabled = false
    },

    //视频上传成功后更新数据
    handleVideoSuccess(res, file, fileList) {
      this.video.videoSourceId = res.data.videoId
      this.video.videoOriginalName = file.name
    },

    //视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },

    //删除视频
    removeVideo(videoId) {
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      })
        .then(() => {
          return videoApi.removeById(videoId)
        })
        .then(() => {
          this.fetchChapterNestedListByCourseId() // 刷新列表
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
        })
    },

    //编辑视频
    editVideo(videoId) {
      this.dialogVideoFormVisible = true
      videoApi.getVideoInfoById(videoId).then(response => {
        this.video = response.data.data.item
        this.fileList = [{ name: this.video.videoOriginalName }]
      })
    },

    //保存视频
    saveOrUpdateVideo() {
      this.saveVideoBtnDisabled = true
      if (!this.video.id) {
        this.video.courseId = this.courseId
        this.video.chapterId = this.chapterId
      }
      videoApi.saveOrUpdateVideoInfo(this.video).then(response => {
        this.$message({
          type: 'success',
          message: '保存成功!'
        })
        this.helpSaveVideo()
      })
    },

    //保存课时成功后刷新列表
    helpSaveVideo() {
      this.dialogVideoFormVisible = false // 如果保存成功则关闭对话框
      this.fetchChapterNestedListByCourseId() // 刷新列表
      this.video.title = '' // 重置章节标题
      this.video.sort = 0 // 重置章节标题
      this.video.videoSourceId = '' // 重置视频资源id
      this.saveVideoBtnDisabled = false
    },

    //上一步
    previous() {
      console.log('previous')
      this.$router.push({ path: '/ucenter/info/' + this.courseId })
    },

    //下一步
    next() {
      console.log('next')
      this.$router.push({ path: '/ucenter/publish/' + this.courseId })
    }
  }
}
</script>

<style scoped>
.chapterList {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.chapterList li {
  position: relative;
}
.chapterList p {
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #ddd;
}
.chapterList .acts {
  float: right;
  font-size: 14px;
}

.videoList {
  padding-left: 50px;
}
.videoList p {
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #ddd;
}
</style>
